This tall stackable 40-pin female header features two rows of 20 pins spaced with a 0.1″ (2.54 mm) pitch.
It includes one 0.1″-thick spacer for additional clearance, and the extended pins allow multiple units to be stacked as popularized on Arduino shields. The 2×20 size is notably used on the Raspberry Pi Models B+, and the extra height allows for stacked boards to clear all of the components on your Raspberry Pi.
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